achromatin vs body substance

achromatin and body substance both are nouns.

Word	Noun	Adjective	Verb	Adverb
achromatin	Yes	No	No	No
body substance	Yes	No	No	No

As nouns, body substance is a hypernym of achromatin; that is, body substance is a word with a broader meaning than achromatin:

achromatin: the part of a cell nucleus that is relatively uncolored by stains or dyes
body substance: the substance of the body

achromatin (noun)	body substance (noun)
the part of a cell nucleus that is relatively uncolored by stains or dyes	the substance of the body